D.S.
SH, what has happened that you are so concerned? I was diagnosed with the illness then death of myhusband. They call it enviromental bi polor disorder. So there are many different causes and effects. I know that I can get manic,going either to being a sad and lonely woman and/or being the grateful Grandmother of 12 and the mother of 5 and having hours to spend with them, and even when I am sad I perk up by the sounds of the little ones happy noise.
There are often tests in magazines, or you can go online and take tests to see if yuhave any of the common traits so try doing that and see what happens, consider talking to her doctor and see if he can talk withher about what changes are going on in her life. Depending on her age it could allbe hormonenal with the "change of life effects".
As for the family,since ours was caused by the slow deathof a dear and beloved husband and father many of us were depressed andsad, and feeling the changes this was going to bring us. So we made a point to uplift one another and to be supportive as best as possible. But you have to be sure its not something else since this is an life long prblem. Good Luck and I wish yo the peace of mind.